Extremely, much,
Excalibur is a much better word than exclaimed, in my opinion.
Even better!
Every word has a purpose, which it fulfills successfully. There might be a better word than grin in some context, but you haven't stated any context. You would have to tell us what purpose you have in mind, which is not quite fulfilled by the word grin.
there are no better words than sad
Loves is better than likes.
a better word than attention is ............................looking
A better word than cold can be FROZEN .................
The word for thinking you are better than others is "arrogance" or "egotism."
Some that is not a word and will never be a word. Please try again. Sorry.
The word most is already in the superlative form. There is no better form.Mostest, for instance, is not a valid word.
"Arrogant" or "delusional" (if the person is NOT actually better than others). Keep in mind, some people ARE better than others (i.e. more talented/skillful/knowledgeable/etc). In those cases, they aren't 'arrogant' or "delusional" they are just 'better' than others.