• 侯爵こうしゃく — marquis (noble rank)
• 諸侯しょこう — feudal lords; nobles
• 王侯おうこう — kings and nobles
• 列侯れっこう — feudal lords (classical)

侯 is mainly seen in words about nobility, such as 侯爵こうしゃく and 諸侯しょこう.

A useful tip: 侯 is closely related in shape to 候 (the kanji used in 気候きこう and 天候てんこう). The difference is that 候 has an extra vertical line, which helps you keep “noble” (侯) separate from “weather / climate” (候).