decad

As nouns the difference between heptad and decad

is that heptad is a group of seven things while decad is .

As a noun decad

is .

As an adjective decadal is

of or pertaining to the number ten, a group of ten things, or to a decade.

As a noun decad is

.

As nouns the difference between decan and decad

is that decan is the subdivision of a zodiacal sign into a period of 10 days or 10 degrees while decad is archaic form of decade.

As nouns the difference between decal and decad

is that decal is a design or picture produced in order to be transferred to another surface either permanently or temporarily while decad is .

As nouns the difference between decaf and decad

is that decaf is (informal) a decaffeinated coffee, tea, or soft drink while decad is .

As nouns the difference between decad and decay

is that decad is while decay is the process or result of being gradually decomposed.

As a verb decay is

to deteriorate, to get worse, to lose strength or health, to decline in quality.

As a noun decad

is archaic form of decade.

As a verb decard is

to discard.

As nouns the difference between dead and decad

is that dead is tooth while decad is .