Answer:

alpha

Answer	Crossword Clue
ALPHA	Omega's antithesis
ALPHA	Lead in for particle or wave
ALPHA	Top (dog)

ALPHA	Word before male or dog
ALPHA	Greek leader?
ALPHA	Kind of male
ALPHA	Leading character?
ALPHA	First of the Greeks
ALPHA	Top, in a hierarchy
ALPHA	Aristotle's A
ALPHA	Greek's first

ALPHA	First of a series
ALPHA	... particle (helium-atom nucleus)
ALPHA	... particles (radioactive decay emission)
ALPHA	... particle
ALPHA	Highest in rank, among animals
ALPHA	First in a series
ALPHA	Series opener
ALPHA	Greek letter

ALPHA	Series beginning
ALPHA	Dominant
ALPHA	Highest-ranking, in a way
ALPHA	A, to Aristotle
ALPHA	Beginning
ALPHA	Omega's opposite
ALPHA	Top dog
ALPHA	Leader in Athens?

ALPHA	Pack leader
ALPHA	A, as in Athens
ALPHA	Breakfast cereal prefix
ALPHA	Wolf pack leader
ALPHA	.. male
ALPHA	...-Bits: cereal
ALPHA	Male in charge
ALPHA	Letter before beta

ALPHA	Kind of particle or wave
ALPHA	Constellation's brightest star
ALPHA	Leading male in a wolf pack
ALPHA	Highest wolf pack rank
ALPHA	Starting letter