No, it is a noun. But it can be used as a noun adjunct with nouns as in "backyard barbecue" and "backyard mechanic."
The word backyard itself is used as an adjunctive noun (not an adjective) when paired with another noun, e.g. backyard barbecue, backyard mechanic. The word backyard is not an attribute in either case.
The adjectives in the sentence are:injuredthismy (pronoun, a possessive adjective)her (pronoun, a possessive adjective)
injured
No, backyard isn't an adverb. It is a noun, and may be an adjunct in terms like backyard barbecue.
The adjectives in the sentence are:injuredthisyour (pronoun, a possessive adjective)her (pronoun, a possessive adjective)
The primary adjective is "injured" describing the noun bird. "Her" is a attributive adjective as well, but may also be classified as a possessive pronoun.
It can be, depending on how you use it, for example: The marching band is going around town. (adjective) or it can be used as a verb: The children are marching around the backyard. It is mostly used as a verb, though.
excited and upcoming :)
Depends what backyard.
in your backyard
My backyard My backyard
backyard fish culture