No. Yesterday can be a noun, or more usually an adverb. It cannot modify a noun except in the possessive form (yesterday's).
The word "windy" is always used as an adjective, because it alwasys describes something. For example: "That day yesterday was really windy." It describes the day that it was like yesterday(that day)
adverb - yesterday adjective - new
Unbearable is an adjective. It describes something that cannot be tolerated. "Yesterday's heat was unbearable."
yesterday is an adverb
Yesterday I bought a ninety-dollar jacket On the weekend we went for a two-hour trip. My sister visited yesterday with her three-month-old baby. ( a three word one)
"That's yesterday's news..." uses 'yesterday' to qualify the pronoun 'news'.
In the sentence "Yesterday he played loudly with his two new puppies in their very big backyard," the parts of speech for each word are as follows: "Yesterday" (adverb), "he" (pronoun), "played" (verb), "loudly" (adverb), "with" (preposition), "his" (pronoun), "two" (adjective), "new" (adjective), "puppies" (noun), "in" (preposition), "their" (pronoun), "very" (adverb), "big" (adjective), and "backyard" (noun).
'Yesterday' is not an adjective and does not have a comparative degree. It means 'the day immediately before today'. Something cannot happen on 'the day more immediately before today' - it makes no sense. Expressions such as 'the day before yesterday', 'a week ago yesterday', and so on, are used to indicate dates further in the past, but they do not constitute the comparative degree.
The Luhya word for the English word yesterday is jana.
You would say 'John's yesterday lecture' as 'John's yesterday's lecture' would make it an adjective.
I think yesterday is a noun, because it is definitley not a verb or adjective. It is not an action and it does not describe anything.
Neither. It's a noun. It can be a direct object though. Ie. We bought the camera yesterday.