Bell-bottoms and Trouser

Bell-bottoms noun - Trousers with legs that flare; worn by sailors; absurdly wide hems were fashionable in the 1960s.

Trouser and bell-bottoms are semantically related. In some cases you can use "Trouser" instead a noun phrase "Bell-bottoms".

Trouser noun - (usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately.

Bell-bottoms and trouser are semantically related. Sometimes you can replace phrase "Bell-bottoms" with "Trouser", this terms are similar.