Usar Terminación y acabar

Hola Sarah

They are two ways to say the same "[with] ending in -o/-a":

con terminación en o 

con terminación en a

this is literally "with ending in o/ in a"

que acaban en o 

que acaban en a

this is literally "that end in o / in a"

so we're using a different translation but they mean the same. 

I hope it clarified it.

Saludos cordiales

Inma