- Underground invader
- underground irrigation channel
- Underground item frequently swiped
- Underground Kentucky attraction
- Underground laborer
- Underground launch site
- Underground lava
- Underground layer of mineral
- Underground letters
- Underground locale
- Underground mammal
- Underground maze
- Underground meeting place
- Underground metals
- Underground missile launch site
- Underground molten rock
- Underground nesters
- Underground network
- Underground networks
- Underground org.
- Underground org. in N.Y.C.
- Underground part
- Underground part of a plant
- Underground parts of a plant
- underground passage
- Underground passages
- Underground pest
- Underground petroleum source
- Underground pit
- Underground places with bats
- Underground plant part
- Underground plant parts
- Underground plant supports
- Underground prison
- Underground purchases
- Underground railroad
- Underground Railroad "passenger"
- Underground Railroad destination
- Underground Railroad hiding place
- Underground Railroad leader
- Underground Railroad traveler
- Underground Railroad user
- underground railway
- underground railway system, esp in Paris
- Underground railways of Paris and DC
- Underground recess
- underground reservoir
- UNDERGROUND reservoir of natural water
- Underground resource
- Underground riches
- Underground rider, probably
- UNDERGROUND river
- Underground rock
- Underground rock bands?
- Underground rodent
- Underground Roman burial place
- UNDERGROUND room
- Underground room for wine
- Underground route
- underground shelter
- Underground source of diamonds
- Underground source/storehouse of water
- Underground space
- underground spirit
- underground stem
- Underground storage spot
- Underground store
- Underground story
- UNDERGROUND stream
- Underground stuff
- Underground support
- Underground supporter
- Underground system
- Underground systems
- underground takeaway service
- Underground tombs
- Underground train or tram
- Underground trains
- Underground transport
- Underground transport systems
- Underground transportation
- Underground treasure
- Underground treasures
- Underground tunneler
- Underground tunnels
- Underground type
- Underground vault
- Underground vault access
- Underground vaults
- Underground vegetable
- Underground vegetable with edible greens
- Underground warning ... or a warning about four squares in this grid
- Underground waste
- Underground waste conduits
- Underground water source
- Underground water sources
- Underground wealth
- Underground work site
- UNDERGROUND worker
- Underground worker, perhaps
- Underground workers
- Underground workplace
- Underground-railroad cargo
- Undergrounddiscovery
- Undergrounds
- Undergrown
- Undergrowth
- underhand
- Underhand behaviour
- underhand dealing
- underhand deceitful
- Underhand toss
- underhand two words
- Underhand?
- Underhanded
- Underhanded activities
- Underhanded and tawdry
- Underhanded attack
- Underhanded bum
- Underhanded campaign tactic
- Underhanded characters
- Underhanded commercial ploy
- Underhanded fling
- Underhanded one
- Underhanded or duplicitous
- UNDERHANDED person
- Underhanded plan
- Underhanded schemer
- Underhanded schemes
- Underhanded so-and-sos
- Underhanded sort
- Underhanded sorts
- Underhanded throw
- Underhanded type
- Underhanded undertaking
- Underhanded, to put it nicely
- Underhandedly clever
- Underhandedly obtain
- underhandedness
- Underinflated tire's need
- Underlie
- Underline
- Underline alt.
- Underline or italicize
- Underline or italicize, say
- Underline or overload
- Underline, say
- Underlined
- Underlined superscript numbers, sometimes: Abbr.
- Underlined.
- Underling
- Underling (abbr.)
- Underling of yore
- Underling's acquiescence
- Underlings
- Underlings follow them
- Underlings of a capt.
- Underlings of sgts.
- Underlings.
- Underlining alternative
- Underlining alternative: Abbr.
- Underlining equiv.
- Underlit
- underly
- Underlying
- underlying and often distinct theme in a piece of writing or conversation
- Underlying assumption
- Underlying cause
- Underlying character
- Underlying cosmic principle
- Underlying culture of a group
- Underlying explanation
- Underlying form of a word
- Underlying idea
- underlying intention
- Underlying layers
- Underlying meaning
- Underlying meaning of words written or spoken
- underlying motive
- Underlying patterns
- Underlying principle
- Underlying principle of the universe
- Underlying reason
- Underlying rock layers
- Underlying structure
- underlying substance
- UNDERLYING substance (metaphys.)
- Underlying support
- Underlying theme
- underlying theme in a piece of writing
- Underlying values
- Underlying, as metabolism
- undermanned
- Undermine
- Undermine authority
- undermine from within
- undermine or subvert a government
- Undermine, as confidence
- Undermine, in a way
- Undermined
- Undermined the confidence of
- Undermines
- Undermines, as support
- undermost
- UNDERMOST room
- Underneath
- Underneath all the layers
- undernourished
- undernourishment
- Underpaid
- Underpaid employee's demand
- Underpaid worker
- underpants
- underpart
- underpart of a body, as of an animal or motor vehicle
- Underpass
- Underpass concern
- Underperforming investment, slangily
- underpin
- underpinning
- Underpinnings
- Underpinnings of Windows 1.0
- underpraise
- underprice
- underpriced
- underprivileged
- Underprivileged one
- underprop
- underprovided
- underrate
- Underscore
- Underscore neighbor
- Underscore?
- Underscored
- Underscores
- undersea
- Undersea acronym
- Undersea craft
- Undersea craft (Abbr.)
- UNDERSEA dweller
- undersea explorer
- Undersea job?
- Undersea prowler
- Undersea prowler, briefly
- Undersea tracker
- Undersea trackers
- Undersea travelers
- Undersea vegetation
- Undersea vessel
- Undersea vessels