aspheric vs aspherical

aspheric and aspherical both are adjectives.

Word	Noun	Adjective	Verb	Adverb
aspheric	No	Yes	No	No
aspherical	No	Yes	No	No

As adjectives, aspheric and aspherical are synonyms defined as:

aspheric and aspherical: varying slightly from a perfectly spherical shape

aspheric (adjective)	aspherical (adjective)
varying slightly from a perfectly spherical shape	varying slightly from a perfectly spherical shape