yus vs little yus

yus and little yus both are nouns.

Word	Noun	Adjective	Verb	Adverb
yus	Yes	No	No	No
little yus	Yes	No	No	No

As nouns, little yus is a hyponym of yus; that is, little yus is a word with a more specific, narrower meaning than yus:

yus: a Common Slavonic nasal vowel in the early Cyrillic and Glagolitic alphabets.
little yus: a Common Slavonic nasalized front vowel in the early Cyrillic and Glagolitic alphabets.

Other hyponyms of yus include big yus.

yus (noun)	little yus (noun)
a Common Slavonic nasal vowel in the early Cyrillic and Glagolitic alphabets.	a Common Slavonic nasalized front vowel in the early Cyrillic and Glagolitic alphabets.