subtopic
noun
sub·top·ic
ˈsəb-ˌtä-pik
variants
or sub-topic
plural subtopics or sub-topics
: a topic that is part of a broader or more general topic
… each topic branches off into subtopics. For example, within the Asia area you may find separate discussion threads about Vietnam, Thailand, Malaysia and Bali.—John Eckhouse
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Merriam-Webster unabridged
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