synchronous vs synchronal

synchronous and synchronal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
synchronous	No	Yes	No	No
synchronal	No	Yes	No	No

As adjectives, synchronous and synchronal are synonyms defined as:

synchronous and synchronal: occurring or existing at the same time or having the same period or phase

Other synonyms of synchronous include synchronic.

synchronous (adjective)	synchronal (adjective)
occurring or existing at the same time or having the same period or phase	occurring or existing at the same time or having the same period or phase
(digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions