dissimulator vs deceiver

dissimulator and deceiver both are nouns.

Word	Noun	Adjective	Verb	Adverb
dissimulator	Yes	No	No	No
deceiver	Yes	No	No	No

As nouns, deceiver is a hypernym of dissimulator; that is, deceiver is a word with a broader meaning than dissimulator:

dissimulator: a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives
deceiver: someone who leads you to believe something that is not true

Other hypernyms of dissimulator include beguiler, cheat, cheater, slicker, trickster.

dissimulator (noun)	deceiver (noun)
a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives	someone who leads you to believe something that is not true