As nouns the difference between gender and cisperson
is that
gender is (grammar) a division of nouns and pronouns (and sometimes of other parts of speech), such as masculine / feminine / neuter, or animate / inanimate while
cisperson is (lgbt) a cisgender/cissexual person: one whose gender matches his or her biological sex.
As a verb gender
is (sociology) to assign a gender to (a person); to perceive as having a gender; to address using terms (pronouns, nouns, adjectives) that express a certain gender or
gender can be (archaic) to engender.