As nouns the difference between midday and noonish
is that midday is noon; twelve o'clock during the day while noonish is (colloquial) any time close to noon; midday or thereabouts.
midday
English
Noun
noon; twelve o'clock during the day
Antonyms
* midnight
See also
*
noonish
English
Noun
(-)
(colloquial) Any time close to noon; midday or thereabouts.
Synonyms
* twelveish