blot vs soak up

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

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

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

Other hypernyms of blot include absorb, draw, imbibe, sop up, suck, suck up, take in, take up.

blot (noun)	soak up (noun)
an act that brings discredit to the person who does it
a blemish made by dirt

blot (verb)	soak up (verb)
dry (ink) with blotting paper	devote (oneself) fully to
make a spot or mark onto	take in, also metaphorically