Subculture and Subgroup

Subculture noun - A social group within a national culture that has distinctive patterns of behavior and beliefs.

Subgroup and subculture are semantically related. In some cases you can use "Subgroup" instead a noun "Subculture".

Subgroup noun - A distinct and often subordinate group within a group.

Subculture and subgroup are semantically related. Sometimes you can replace term "Subculture" with "Subgroup", this nouns are similar.