先生 (せんせい)teacher; instructor; master

teacher; instructor; masternoun (common) (futsuumeishi)
sensei; title or form of address for a teacher, master, doctor, lawyer, etc.noun (common) (futsuumeishi), noun, used as a suffix
intimate or teasing form of addressnoun (common) (futsuumeishi)
one's eldernoun (common) (futsuumeishi)

先生, its kanji, and other words that share them.Open this graph

Kanji in 先生

先月せんげつlast month
先進国せんしんこくadvanced (developed) country; advanced nations
優先ゆうせんpreference; priority
先発せんぱつstarting in advance; starting first
先にさきにpreviously; before
先進せんしんadvanced; developed
先頭せんとうhead; lead
先行せんこうgoing ahead; going first
学生がくせいstudent (esp. a university student)
生活せいかつliving; life (one's daily existence)
生産せいさんproduction; manufacture
人生じんせい(human) life (i.e. conception to death)
厚生省こうせいしょうMinistry of Health and Welfare (now Ministry of Health, Labour and Welfare)
年生ねんせいpupil in ... year; student in ... year
新生しんせいrebirth; new birth
生徒せいとpupil; student

See how 先生 connects to the rest of Japanese.