As adjectives the difference between dense and ultradense

is that dense is having relatively high density while ultradense is extremely dense; of utmost density.

As a noun density

is (physics) a measure of the amount of matter contained by a given volume.

As an adjective ultradense is

extremely dense; of utmost density.

As an adverb extremely

is (degree) to an extreme degree.

As an adjective ultraviolent is

extremely violent.

As adjectives the difference between violent and ultraviolent

is that violent is involving extreme force or motion while ultraviolent is extremely violent.

As a verb violent

is (archaic) to urge with violence.

As a noun violent

is (obsolete) an assailant.

As an adverb extremely

is (degree) to an extreme degree.

As an adjective ultradry is

extremely dry.

As an acronym dry

is (computing).

As an adjective ultradry is

extremely dry.

As nouns the difference between stimulus and stimulon

is that stimulus is while stimulon is (genetics) a system of genes that are regulated by the same stimulus.

As adjectives the difference between platelike and squamosal

is that platelike is having characteristics of a plate while squamosal is (anatomy) of or pertaining to the platelike part of the temporal bone.

As a proper noun sphingidae

is .

As a noun sphingid is

(biology) any of many hawk moths of the family sphingidae .

As an adjective sphingid is

of or pertaining to these moths.

As adjectives the difference between salty and unsalty

is that salty is tasting of salt while unsalty is not salty.