亢 ⇒
亢奋 kàngfèn, [亢奮], excited/stimulated
高亢 gāokàng, high-pitched and penetrating (musical instrument, voice etc)/high-spirited/fever...
亢进 kàngjìn, [亢進], hyperfunction (medical)
甲亢 jiǎkàng, hyperthyroidism/abbr. for 甲狀腺功能亢進|甲状腺功能亢进[jiǎ zhuàng xiàn gōng néng kàng jìn]
不卑不亢 bùbēibùkàng, neither servile nor overbearing (idiom)/neither obsequious nor supercilious