hypercompact

As a noun terms

is .

As an adjective hypercompact is

extremely compact.

As a noun star

is star.

As an adjective hypercompact is

extremely compact.

As a noun cluster

is cluster (group of galaxies or stars).

As an adjective hypercompact is

extremely compact.

As adjectives the difference between dense and hypercompact

is that dense is having relatively high density while hypercompact is extremely compact.

As adjectives the difference between compact and hypercompact

is that compact is closely packed, ie packing much in a small space while hypercompact is extremely compact.

As a noun compact

is an agreement or contract or compact can be a small, slim folding case, often featuring a mirror, powder and a powderpuff; that fits into a woman's purse or handbag, or that slips into ones pocket.

As a verb compact

is to make more dense; to compress.