@Mr_NutterButter don't even get me started on then and than

Then is only used when talking about time and order of things (eg. I ate then had a drink)

Than is only for comparing two things (eg. A hill is smaller than a mountain)

Both together - A bird jumped then flew, I'd rather be a bird than a mouse

@Jazzy_Butts
You forgot some important things:

"Then" is almost exclusively used for linking events which happened in direct relation to each other, otherwise it sounds awkward and doesn't make much sense.
Yes: "I left work and then went home."
Not really: "I got pregnant and then had a fever."

"Than" is mostly used things that can be (relatively) *directly* compared.
@Mr_NutterButter

@wolfbro @Mr_NutterButter I didn't know that about "then", to me the pregnancy and fever one makes sense still

@Jazzy_Butts I was trying to think of events that were *chronologically sequential* but made no sense being linked together. @Mr_NutterButter