かんごし
nurse
kangoshi
JMdict 1928100
私(わたし)Iは看護師(かんごし)nurseです
I'm a nurse
は (topic) raises "I" as the topic (私(わたし) (I)) — "as for me…". Then the noun 看護師(かんごし) (nurse) is stated and tied off with polite です (is). This [topic] は (topic) [noun] です (is) frame is the basic polite way to say "X is Y."