blot vs sop up

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

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

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

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

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

blot (verb)	sop up (verb)
dry (ink) with blotting paper	take up as if with a sponge
make a spot or mark onto	take in, also metaphorically