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why can you say "yesterday" and "yesteryear" but not "yestermonth" or "yesterhour"?
and here's a rare "yestermonth" (1909):
Love, who hath cast out fear, behold
Thy handiwork, how good it is!
This mouth that hath not known a kiss,
This hair that wraps me fold on fold!
But yestermonth, if one had told
Their beauty I had mocked; to-night
They are my coin to buy delight—
My mouth my eyes my arms are gold !
[by Theodosia Pickering Garrison https://books.google.com/books?id=HO00AAAAMAAJ&dq=%22yestermonth%22&pg=PA144#v=onepage&q=%22yestermonth%22&f=false]
