specialist; expert

reach, extend to, cover, span, run to

(idiomatic) needless to say

to refer to, to mention

speciality/specialty; subject of study; subject of expertise; area of interest; profession

a house / one's own home / a home, household / a family

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

expert, special

academy (specialized school), vocational school

someone who is only knowledgeable within the field in which they specialize; a fachidiot