The English language has no term that covers both auntand uncle and does not imply a gender. The closest you can come is a phrase, where you describe them as the siblings of one of your parents.
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The noun 'shepherdess' is a gender noun specifically for a female who tends sheep. The noun 'shepherd' is a common gender noun as a word for a male or a female who tends sheep.
The noun 'viceroy' is a common gender noun, a word for a person appointed to rule a country or province as the deputy of the sovereign and a brightly marked American butterfly. Depending on the sovereign and the laws of that sovereignty, a viceroy may by law be a male but the noun 'viceroy' is not gender specific. Another sovereignty may choose to appoint a female to the post.
Common sense should tell you that common sense is not a word, it is a phrase made from two words.
Here is a common saying that uses the word reliable. As reliable as a screen door on a submarine.
The word century is a common noun. The word fifteenth is functioning as an adjective (not a noun) decribing the noun century.