galaxy

nouns

a splendid assemblage (especially of famous people)
is a type of (narrower)
several things grouped together or considered as a whole
tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall
(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
"`extragalactic nebula' is a former name for `galaxy'"
is derived from