tubby

As adjectives the difference between slender and tubby

is that slender is thin; slim while tubby is stout, rotund.

As a noun tubby is

(pejorative|slang|often used teasingly) an overweight person.

As adjectives the difference between doughy and tubby

is that doughy is having the characteristics of dough especially in appearance or consistency: as while tubby is stout, rotund.

As a noun tubby is

an overweight person.

Plump is a synonym of tubby.

As adjectives the difference between tubby and plump

is that tubby is stout, rotund while plump is having a full and rounded shape; chubby, somewhat overweight.

As nouns the difference between tubby and plump

is that tubby is an overweight person while plump is a knot or cluster; a group; a crowd.

As a verb plump is

to grow plump; to swell out.

As an adverb plump is

directly; suddenly; perpendicularly.