sop up vs blot

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

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

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

Other hyponyms of sop up include mop, mop up, wipe up, sponge up.

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

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