As nouns the difference between weekends and weekdays
is that weekends is plural of lang=en while weekdays is plural of lang=en.
As adverbs the difference between weekends and weekdays
is that weekends is at weekends while weekdays is on weekdays.
As a verb weekends
is third-person singular of weekend.
weekends
English
Noun
(head)
Verb
(head)
(weekend)
Adverb
(-)
At weekends.
----
weekdays
English
Noun
(head)
Adverb
(-)
On weekdays.