Common noun; Noun, used as a suffix

gate

もん only; Common noun; Noun, used as a suffix

branch of learning based on the teachings of a single master

もん only; Common noun; Noun, used as a suffix; Biology

division; phylum

もん only; Counter

counter for cannons

speciality; specialty; special subject of study; area of expertise; (one's) field; (one's) major

sole interest; single focus; concentrating exclusively on; doing exclusively; sticking to

戸 only

door (esp. Japanese-style)

shutter; window shutter

Archaic

entrance (to a home)

Archaic

narrows

specialist; expert; professional; authority; pundit

Noun or participle which takes the aux. verb suru; Intransitive verb

study; scholarship; learning; education; knowledge

discipline; branch of learning; (a) science

emperor (of Japan); mikado

御門 only; Honorific

(the gates of an) imperial residence

school gate

gatekeeper; door guard; doorman; concierge; janitor

main gate; main entrance

division (of a larger group); branch; field; class (subclass); group; category; department