Spells words (5)

I believe the answer is:

terms

I believe this is a double definition.

'spells' is the first definition.
(both can mean periods of time)

'words' is the second definition.
(term is a kind of word)

(Other definitions for terms that I've seen before include "Academic periods" , "Work periods" , "Times" , "Divisions of the academic year" , "Conditions; charge" .)

I've seen this clue in The Telegraph.

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