The plural of taco is tacos.
When something is plural, it means more than one.
An example sentence is: The seagulls swooped down and snatched our tacos.
The plural of "taco" is "tacos." In English, the plural is typically formed by adding an "s" to the end of the word. So, one taco becomes multiple tacos when referring to more than one.
Latches.
daddies.
Clouds
circus's
slides
axes
That is the correct spelling "princesses" for more than one princess.
I think perhaps you are trying to spell countries, as in more than one country.
Trophies
spell it out - there is more than one ADEA
One activist. Several activists.