disguise vs dissimulate

disguise is a noun but dissimulate is not a noun.

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

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

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

disguise (noun)	dissimulate (noun)
the act of concealing the identity of something by modifying its appearance
any attire that modifies the appearance in order to conceal the wearer's identity
an outward semblance that misrepresents the true nature of something

disguise (verb)	dissimulate (verb)
make unrecognizable	hide (feelings) from other people