variants
or less commonly sub-type
plural subtypes also sub-types
: a type that is a subdivision of a broader type
… the … vaccine has a new, additional molecular component that its developers believe will contribute to a broader range of protection against subtypes of HIV found in North America, Europe, Australia, Central America, and South America.—The Journal of the American Medical Association
… the neurotransmitter serotonin has at least 14 different known subtypes of receptors.—Steven F. Hyman
Among subtypes of juggling found in circus shows are juggling on horseback and strong-man juggling with iron balls.—Mark Levine
Love words? Need even more definitions?
Merriam-Webster unabridged
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