Oh, dude, you're really making me work here. So, technically speaking, the comparative form of "massive" is "more massive" and the superlative form is "most massive." But like, who even uses those fancy terms in real life, right? Just say something like "bigger" or "biggest" and call it a day.
The comparative is greater and the superlative is greatest.
comparative straighter and the superlative the straightest
Comparative - cuter Superlative - cutest
Comparative - better Superlative - best
"Bit" is a noun and a verb and, as such, does not have a comparative or superlative form.
comparative : purer superlative : purest
Comparative: older Superlative: oldest
Dative; Early Comparative; Earlier Superlative; Earliest
The comparative and superlativeforms of grand are: Comparative: grander Superlative: grandest
comparative - merrier superlative - merriest
Comparative: shallower Superlative: shallowest
The comparative is "stricter" and the superlative is "strictest".
comparative = sadder superlative = saddest
The comparative is greater and the superlative is greatest.
comparative - rockier superlative - rockiest
Comparative - better Superlative - best
Comparative is more and superlative is most.