Diminutive
noun
(grammar) A word form expressing smallness, youth, unimportance, or endearment.
“Booklet, the diminutive of book, means ‘small book’.”
Synonyms: nomen deminutivum, pet form
adjective
Very small.
Serving to diminish.
(grammar) Of or pertaining to, or creating a word form expressing smallness, youth, unimportance, or endearment.
Synonyms: lilliputian, tiny