transgendered vs transgender

transgendered is a noun but transgender is not a noun.

Word	Noun	Adjective	Verb	Adverb
transgendered	Yes	Yes	No	No
transgender	No	Yes	No	No

As adjectives, transgendered and transgender are synonyms defined as:

transgendered and transgender: involving a partial or full reversal of gender

transgendered (noun)	transgender (noun)
a person who has undergone a sex change operation

transgendered (adjective)	transgender (adjective)
involving a partial or full reversal of gender	involving a partial or full reversal of gender