compress vs bear down

compress is a noun but bear down is not a noun.

Word	Noun	Adjective	Verb	Adverb
compress	Yes	No	Yes	No
bear down	No	No	Yes	No

As verbs, bear down is a hyponym of compress; that is, bear down is a word with a more specific, narrower meaning than compress:

compress: squeeze or press together
bear down: contract the abdominal muscles during childbirth to ease delivery

Other hyponyms of compress include choke, strangle, prim, astringe, strangulate, convulse, convulse, overbear, choke, fret, gag, choke, scrag.

compress (noun)	bear down (noun)
a cloth pad or dressing (with or without medication) applied firmly to some part of the body (to relieve discomfort or reduce fever)

compress (verb)	bear down (verb)
squeeze or press together	exert a force or cause a strain upon
make more compact by or as if by pressing	pay special attention to
	exert full strength
	to make a rush at or sudden attack upon, as in battle
	exert a force with a heavy weight
	contract the abdominal muscles during childbirth to ease delivery