1. In what manner; to what extent; for what reason; by what means.

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

• holow,
• hw,
• hom,
• oow,
• howt,
• howy,
• howar,
• hon,
• hol,
• hoow,
• howm,
• ehow,
• shiow,
• yow,
• hoo,
• howz,
• hos,
• moww,
• hof,
• woaw

• low,
• hoye,
• pow,
• howe,
• hoya,
• cow,
• H,
• Howie,
• hoy,
• sow,
• row,
• show,
• hot,
• now,
• mow,
• vow,
• hoey,
• chow,
• howey,
• bow,
• wow,
• hog,
• hooey,
• HOU,
• Hoa,
• howl,
• tow,
• ho,
• hop,
• hoe.

The adjective form of the word "how" is "howful". However, it is a fairly rare and uncommon adjective in contemporary usage.

The plural of the "how" can be the "hows".

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