matt-up vs mat up

matt-up and mat up both are verbs.

Word	Noun	Adjective	Verb	Adverb
matt-up	No	No	Yes	No
mat up	No	No	Yes	No

As verbs, matt-up and mat up are synonyms defined as:

Other synonyms of matt-up include felt, felt up, mat, matte, matte up.

matt-up (verb)	mat up (verb)
change texture so as to become matted and felt-like	change texture so as to become matted and felt-like