Comprehensive has more than two syllable so use more and most
His dictionary is more comprehensive than this one.
That is the most comprehensive dictionary I have seen.
Complete is usually used as an adjective, such as "a complete salad". It can also be used as a verb, such as "Please complete your homework."
The adjective thorough (compete, painstaking) has the comparative more thorough and the superlative most thorough.
comparative form is more complete
superlative form is most complete
more complete
more perfect
imcomplete
Adverb
Verb
comparative - merrier superlative - merriest
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
comparative=tenser superlative =tensest
The comparative form of tight is "tighter". The superlative form is "tightest".
The comparative form of tinny is tinnier, and the superlative form is tinniest.
comparative - merrier superlative - merriest
"Older" is the comparative form of old. The superlative form is oldest.
Bitter is a comparative and a bittest is superlative
Sweetie is a noun and does not have a comparative or superlative form.
Comparative: older Superlative: oldest
The comparative form of cloudy is "cloudier". The superlative form is "cloudiest".
"Larger" is the comparative form of large. The superlative form is largest.
The comparative form of easy is easier, and the superlative form is easiest.
The comparative form of gloomy is gloomier, the superlative form is gloomiest.
"Easier" is the comparative form of easy. The superlative form is easiest.
The comparative form of "well" is "better" and the superlative form is "best."
The comparative form of the word "ugly" is "uglier," and the superlative form is "ugliest."