UNDERGROUND
ADJECTIVES
1592 — SUBTERRANEAL underground → obs.
1607 — SUBTERRANEOUS below the surface of the earth; underground
1610 — SUBTERRENE subterranean; underground
1613 — SUBTERRESTRIAL subterranean, underground
1614 — SUBTERRANE subterranean; below the surface of the earth, underground
1615 — SUBTERRESTRIAL of animate things: living or working underground → obs.
1626 — SUBTERRANY subterranean; underground → obs.
1670 — SUBTERRENEAN subterranean, underground → obs.
1686 — HYPOGEAL existing or growing beneath the surface of the ground; underground; subterranean
1841 — SUB-TERRA subterranean; below the surface of the earth, underground
1852 — HYPOGEAN existing or growing beneath the surface of the ground; underground
1884 — CATACHTHONIC underground, subterranean
1888 — CATACHTHONIAN underground, subterranean
1890 — CUNICULAR pert. to underground passages
NOUNS
1646 — SUBTERRANITY the condition of being subterranean; a place or thing found underground → obs.
1657 — CUNICLE a hole, cave, or passage under ground → obs.
1686 — SUBTERRANEITY the condition of being subterranean; a place or thing found underground → obs.
1774 — SUBTERRANE an underground cave, chamber, or dwelling
1797 — SUBTERRANEAN an underground cave, chamber, or dwelling
1800 — SUBTERRESTRIAL a creature living underground
1854 — SUBTERRENE an underground dwelling, etc.
NOUNS, PERSON
1877 — SANDHOG an underground worker → US sl.
1877 — SAND-HOGGER an underground worker → US sl.
1903 — GROUNDHOG a person who customarily works underground, esp. a miner or caisson worker → US sl.
Lexicophilia 