Seek (/ˈsi:k/) is an English verb.
Seek is an irregular lexical verb - it has the third person form seeks (/ˈsi:ks/), the ing form seeking (/ˈsi:kɪŋ(g)/), but an irregular preterite and past participle 'sought' (/ˈsɔ:t/)
Seek is a transitive verb; one has seek something. Contrast look which is an intransitive verb with broadly similar meaning, so we seek something but look for something.
Sought can be a homophone with "sort" in non-rhotic accents. With th-alveolarisation, then sought can be a homophone with thought (from think).
Note the phrasal verb "seek out" which just means seek.
Note the adjective "sought after"