concentrate vs soak up

concentrate is a noun but soak up is not a noun.

Word	Noun	Adjective	Verb	Adverb
concentrate	Yes	No	Yes	No
soak up	No	No	Yes	No

As verbs, soak up is a hyponym of concentrate; that is, soak up is a word with a more specific, narrower meaning than concentrate:

Other hyponyms of concentrate include absorb, engross, engulf, immerse, plunge, steep, recall, think, zoom in, hear, listen, take heed.

concentrate (noun)	soak up (noun)
a concentrated example of something
a concentrated form of a foodstuff; the bulk is reduced by removing water
the desired mineral that is left after impurities have been removed from mined ore

concentrate (verb)	soak up (verb)
cook until very little liquid is left	devote (oneself) fully to
make denser, stronger, or purer	take in, also metaphorically
make central
be cooked until very little liquid is left
make more concise
compress or concentrate
direct one's attention on something
draw together or meet in one common center