lop vs cut back

lop and cut back both are verbs.

Word	Noun	Adjective	Verb	Adverb
lop	No	No	Yes	No
cut back	No	No	Yes	No

As verbs, lop and cut back are synonyms defined as:

Other synonyms of lop include clip, crop, dress, prune, snip, trim.

lop (verb)	cut back (verb)
cultivate, tend, and cut back the growth of	place restrictions on
cut off from a whole	cut down on; make a reduction in
	cultivate, tend, and cut back the growth of
	return in time