Pleae tell me the difference

As a noun, both paste and glue are adhesives - they join things together. Glue is a stonger adhesive than paste. Paste is usually used to hang wallpaper. Glue is used for everything else.

As a verb, paste or glue is the act of joining things together using adhesives. "I've broken a plate and need to glue it back together".

Intent and Intention mean much the same thing ie planni

I don't think paste is always adhesive (think tooth paste, or dough at in the first definition underneath), while glue is.

They definitely aren't synonyms, see:
http://www.m-w.com/dictionary/paste
http://www.

Indeed it can be - along with paste for cooking etc. I was taking it for granted that alongside 'glue' it was in the context of an adhesive.

Tidus gives these examples: "She is intent on going to college in the Autumn", or, "Her intention is to go to college in the Autumn." This suggests that intent is only an adjective, but in more formal contexts it can be a noun, as in "letter of intent".

That is correct. In the legal sense, intent is a noun.