The Aquamenti charm is also known as the water summoning charm. It's actually both a charm and transfiguration spell as it's considered a conjuration. It allows a witch or wizard to produce a jet or wave of water from their wand.
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Expecto Patronum this spell is known as a Patronus charm.
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'Avis' is a spell that is used to gather/summon a flock of birds. There are several incidents when this spell is used, the most famous (I think) in Book 6 when an angry Hermione summons the birds to attack Ron. In Latin, 'avis' means bird.
Expelliarmus is a spell used by wizards that can disarm the magical creature it is used on.
The Knockback Jinx is a spell which can be used to 'knock back' an opponent, blast jars and creatures or activate magically charmed switches. The incantation of this spell is Flipendo.This spell only really occurs in the video games. It is never mentioned by name in the books or in the movies although it is believed to have been used in the movies as a non-verbal spell. It is still valid as a spell though, as J.K. Rowling has included it in Pottermore.