lam vs beat up

lam is a noun but beat up is not a noun.

Word	Noun	Adjective	Verb	Adverb
lam	Yes	No	Yes	No
beat up	No	No	Yes	No

As verbs, beat up is a hypernym of lam; that is, beat up is a word with a broader meaning than lam:

lam: give a thrashing to; beat hard
beat up: give a beating to; subject to a beating, either as a punishment or as an act of aggression

Other hypernyms of lam include beat, work over.

lam (noun)	beat up (noun)
a rapid escape (as by criminals)

lam (verb)	beat up (verb)
give a thrashing to; beat hard	gather
flee; take to one's heels; cut and run	give a beating to; subject to a beating, either as a punishment or as an act of aggression