It can be, but only as the superlative form of "heavy" used as an adverb.
Heavy, heavier, and heaviest are all normally adjectives. But in some rare uses, both heavy and its comparatives can be used as adverbs.
e.g.
The snow is falling heavier than before. (more heavily)
Time hangs heaviest on their shoulders. (most heavily)
She struggled to lift the heaviest box in the stack.
The superlative degree of heavy is "heaviest."
The superlative word for heavy is "heaviest."
It is an adjective because if you said It was the heaviest object. The word heaviest is describing the noun: object.
heavier, heaviest
heaviest
heaviest, heavier
Heaviest
They are more heavily and most heavily. While the comparatives heavier and heaviest may be used as adverbs, they do so as forms of the word 'heavy' where it is used (rarely) as an adverb.
Heaviest tiger was 900 pouds, but the heaviest polar bear was over 2000 pounds.
No, heaviest is an adjective, the superlative form for the adjective heavy (heavier, heaviest). Example sentence:We bought the heaviest watermelon we could find.
The Airbus A 390 is the heaviest aircraft in productionThe Airbus A 390 is the heaviest aircraft in production
There are no perfect rhymes for the word heaviest.
Usually the engine is heaviest.
The fur is the heaviest in winter.
The skin is the heaviest and biggest organ
Siberian tiger is the heaviest, 600-700Ibs American Lion was the heaviest 800-950Ibs