trench vs moat

trench and moat both are nouns.

Word	Noun	Adjective	Verb	Adverb
trench	Yes	No	Yes	No
moat	Yes	No	No	No

As nouns, moat is a hyponym of trench; that is, moat is a word with a more specific, narrower meaning than trench:

trench: a ditch dug as a fortification having a parapet of the excavated earth
moat: ditch dug as a fortification and usually filled with water

Other hyponyms of trench include approach trench, communication trench, fire trench, fosse, slit trench.

trench (noun)	moat (noun)
a ditch dug as a fortification having a parapet of the excavated earth	ditch dug as a fortification and usually filled with water
any long ditch cut in the ground
a long steep-sided depression in the ocean floor

trench (verb)	moat (verb)
cut or carve deeply into
dig a trench or trenches
cut a trench in, as for drainage
fortify by surrounding with trenches
set, plant, or bury in a trench
impinge or infringe upon