mask vs dissimulate

mask is a noun but dissimulate is not a noun.

Word	Noun	Adjective	Verb	Adverb
mask	Yes	No	Yes	No
dissimulate	No	No	Yes	No

As verbs, dissimulate is a hyponym of mask; that is, dissimulate is a word with a more specific, narrower meaning than mask:

Other hyponyms of mask include cloak, dissemble, mask, masquerade, camouflage.

mask (noun)	dissimulate (noun)
activity that tries to conceal something
a covering to disguise or conceal the face
a protective covering worn over the face
a party of guests wearing costumes and masks

mask (verb)	dissimulate (verb)
put a mask on or cover with a mask	hide (feelings) from other people
shield from light
cover with a sauce
hide under a false appearance
make unrecognizable