backyard fish culture
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.
in your backyard
My backyard My backyard
Depends what backyard.
Stella Otto has written: 'The backyard berry book' -- subject(s): Fruit-culture, Viticulture, Fruit, Berries, Varieties
No, backyard isn't an adverb. It is a noun, and may be an adjunct in terms like backyard barbecue.
a barbecue that goes in your backyard
it depends in what type of backyard you have.
Our Backyard was created in 1984.
No, it is a noun. But it can be used as a noun adjunct with nouns as in "backyard barbecue" and "backyard mechanic."
in his backyard he built a small garden
backyard monsters hacked