Pero
But
Mas
But (very formal)
Entonces
Then
Y
And
E
And (when word after starts with i)
O
Or
U
Or (when work after starts with o)
Ni…ni
Neither…nor
O…o
Either…or
Esto es
That is (to say)/in other words
Es decir
That is to say/in other words
Aunque
Though/even though
Sino
But (when first part if sentence is negative, like rather)
No obstante
However/nevertheless
Excepto
Except/excluding
Sin embargo
However/nevertheless
Para qué
So that, so, in order to
A fin de qué
So that/in order to (formal)