Roget's Thesaurus

#213. Horizontality

Nouns

horizontality; flatness; level, plane; stratum etc. 204; dead level, dead flat; level plane. recumbency, lying down etc. v.; reclination, decumbence; decumbency, discumbency; proneness etc. adj.; accubation, supination, resupination, prostration; azimuth. plain, floor, platform, bowling green; cricket ground; croquet ground, croquet lawn; billiard table; terrace, estrade, esplanade, parterre. [flat land area] table land, plateau, ledge; butte; mesa (plain) 344. [instrument to measure horizontality] level, spirit level.

Verbs

be horizontal etc. adj.; lie, recline, couch; lie down, lie flat, lie prostrate; sprawl, loll, sit down. render horizontal etc. adj.; lay down, lay out; level, flatten; prostrate, knock down, floor, fell.

Adjectives

horizontal, level, even, plane; flat etc. 251; flat as a billiard table, flat as a bowling green; alluvial; calm, calm as a mill pond; smooth, smooth as glass. recumbent, decumbent, procumbent, accumbent; lying etc. v.; prone, supine, couchant, jacent, prostrate, recubant.

Adverbs

horizontally etc. adj.; on one's back, on all fours, on its beam ends.