slash vs trim back

slash is a noun but trim back is not a noun.

Word	Noun	Adjective	Verb	Adverb
slash	Yes	No	Yes	No
trim back	No	No	Yes	No

As verbs, trim back is a hypernym of slash; that is, trim back is a word with a broader meaning than slash:

Other hypernyms of slash include bring down, cut, cut back, cut down, reduce, trim, trim down.

slash (noun)	trim back (noun)
a strong sweeping cut made with a sharp instrument
a punctuation mark (/) used to separate related items of information
an open tract of land in a forest that is strewn with debris from logging (or fire or wind)
a wound made by cutting

slash (verb)	trim back (verb)
cut drastically	cut down on; make a reduction in
cut open
cut with sweeping strokes; as with an ax or machete
beat severely with a whip or rod
move or stir about violently