A grammatical structure where two words connected by a conjuction are used to express a single notion?

this is a question in a crossword, the letters I already know are as follows :- _e_d_a_y_

Answers:
HENDIADYS.
It is, honestly!

Hello, - I've just seen Laura's answer. I confess to asking one of those calculator-style "find a word" gadgets, which gave me hendiadys as the only possibility, and then looking it up in the dictionary. If you knew the answer immediately, Laura, you deserve the points!
HUH
HENDIADYS

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