lop off vs roach

lop off is not a noun while roach is a noun.

Word	Noun	Adjective	Verb	Adverb
lop off	No	No	Yes	No
roach	Yes	No	Yes	No

As verbs, roach is a hyponym of lop off; that is, roach is a word with a more specific, narrower meaning than lop off:

Other hyponyms of lop off include abscise.

lop off (noun)	roach (noun)
	any of numerous chiefly nocturnal insects; some are domestic pests
	European freshwater food fish having a greenish back
	the butt of a marijuana cigarette
	street names for flunitrazepam
	a roll of hair brushed back from the forehead

lop off (verb)	roach (verb)
remove by or as if by cutting	cut the mane off (a horse)
	comb (hair) into a roach