1. The eleventh letter of the English alphabet; a guttural consonant, borrowed from the Greeks, and invariably pronounced hard before vowels; but before the letter n having no sound, as in knee, or knife.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• kk,
• jk,
• rk,
• ck,
• pk,
• nk,
• lk,
• tk,
• ek,
• hk,
• kj,
• k,
• vk,
• mk,
• kl,
• ik,
• kp,
• kn,
• kt,
• fk

• C,
• ok,
• kw,
• y,
• O.K.,
• ky.,
• k2',
• kui,
• kr,
• Kye,
• k's,
• KAO,
• ky,
• J,
• G,
• khi,
• a-,
• KUO,
• ku,
• -y,
• ak,
• W,
• ka,
• Kai,
• KUE,
• Kay,
• ks,
• key,
• kea,
• KUA,
• Kee,
• KHA,
• KOO,
• ko,
• Q,
• KOH,
• Kia,
• L,
• B,
• KEO,
• km,
• ki,
• kwa,
• kg,
• k2,
• A.

The plural of the "K" can be the "K".

The singular of the "K" can be the "K".