asfixiar - to suffocate, to asphyxiate

asimilar - to assimilate, to absorb, to take in

asociar - to associate

asolar - to destroy

asolear - to sun, to get sunburnt, to bask in the sun

asumir - to assume

atañer - to concern

atardecer - to get late, to grow dark

atascar - to obstruct, to block