Synonyms for Not to mention:

adj.

containing (adjective)
Including.
including (adjective)
along with, together with, as well as.

adv.

also (adverb)
in addition, as well as, moreover, further, together with, likewise, besides, too, furthermore, also, And, Including, additionally, along with.
furthermore (adverb)
likewise, besides, additionally, moreover, too.

adv

also (adverb)
in addition, as well as, moreover, further, together with, likewise, besides, too, furthermore, also, And, Including, additionally, along with.

Other synonyms:

adv
furthermore.