eta

As a determiner eta

is many.

As an adjective aetheogamous is

(botany) of the nature of an aetheogam.

As nouns the difference between eta and aetheogam

is that eta is the seventh letter of the Modern Greek alphabet, the eighth in Old Greek while aetheogam is a cryptogam; a plant of the obsolete taxonomic class Cryptogamia, having neither stamina nor pistils, and therefore no proper flowers, such as an alga, fern, fungus, lichen or moss.

As an initialism ETA

is estimated time of arrival.