You have spelled the word correctly: cooperate. It used to have a hyphen co-operate but that is now not used.
More than one province is "provinces".
The plural form of "scarf" is spelled "scarves."
Stimuli is the word you are looking for.
The likely word sought is "seconds" (more than one second, or additional servings).
The correct spelling is "listen" (pay attention to a sound).
Latches.
daddies.
Clouds
circus's
slides
axes
That is the correct spelling "princesses" for more than one princess.
spell it out - there is more than one ADEA
Trophies
I think perhaps you are trying to spell countries, as in more than one country.
One activist. Several activists.
More than one blog=blogs.