Achieve.
Good ones are: Intelligent Imaginative Insightful Inventive Inclusive
You don't mention how many letters in the answer or whether you have any letter clues already filled in - that makes it very difficult to answer your question.To gather ones thoughts or efforts is to become calm or organised or mentally composed.
Only ones I can think of is a Dodge, Desoto or a Delorean.
Haddock, herring, halibut and hake are four common ones.
'T' in all the ones I've seen so far
Brachiosaurus, Brontosaurus, ... these are the only ones i can think of right now ")
Muscles. :D
Liberal, lonely, lean, lanky, loathsome, likeable.
I found one which is livestock. The only other ones which I know which starts with the letter L is lettuce, llama, and lamb.
There are no major cities in Spain that begin with the letter "R". There are some smaller ones, like Requena, Valencia and Retuerta del Bullaque, Castilla-La-Mancha.
As far as I can remember the only ones I know are, Adagio from No.2 and Allegro No.5 but if they are just movements I can't remember.
Xavier (Pronounce Zavier), Xeno (Pronounce Zeno) and Xander (Pronounce Zander). There would be more but these are the only ones at the top of my head.