sub·group

[suhb-groop]
noun
1.
a subordinate group; a division of a group.
2.
Chemistry. a division of a group in the periodic table.
3.
Mathematics. a subset of a group that is closed under the group operation and in which every element has an inverse in the subset.

Origin:
1835–45; sub- + group

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World English Dictionary
subgroup (ˈsʌbˌɡruːp) [Click for IPA pronunciation guide]
 
n
1.  a distinct and often subordinate division of a group
2.  a mathematical group whose members are members of another group, both groups being subject to the same rule of combination

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Subgroup is always a great word to know.
So is elective. Does it mean:
selecting for combination or action; tending to combine with certain substances in preference to others, such as elective attraction
like or containing an alkali, which neutralize acids to form salts and turn red litmus paper blue, or having a pH value greater than 7
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