The noun form for the adjective frequent is frequentness.
The noun forms for the verb to frequent are frequenter, frequency, and the gerund, frequenting.
You could add the prefix in- to it to make the word infrequent.
The most frequent.
(frequently is an adverb)
in-
infrequent
more frequent
Frequently
Disfrequent
Infrequent
Un
Unfrequent
Frequency is a noun and doesn't have a comparative or superlative form.Frequent is an adjective and the comparative form is more frequent and the superlative form is most frequent
The comparative form of solid is solider
The comparative form of in is inner.
comparative - merrier superlative - merriest
"Shine" is a verb and a noun and, as such, does not have a comparative form. The comparative form of the adjective shiny is shinier.
Frequency is a noun and doesn't have a comparative or superlative form.Frequent is an adjective and the comparative form is more frequent and the superlative form is most frequent
more frequently
The comparative form of dreamy is dreamier
The comparative form of busy is busier.
The comparative form of friendly is friendlier.
The comparative form of many is more
The comparative form of "central" is "more central."
The comparative form of "clean" is "cleaner."
The comparative form of friendly is friendlier.
The comparative form of "softly" is "more softly."
Wiser is the comparative form; wisest is the superlative.
The comparative form of solid is solider