What's called? (It'll, Shoulda, Woulda)

[strintvit]

In American english, when people talk in normal/fast pace, a lot of the words are distorted and I want to know if there's a word that refers to them.

Examples:

1. Something > some-um? (I don't know how fully to describe this one.)
2. Would of > woulda
   
3. It'll > It-dul
   
4. Show Them > Show em

 

[SlickVic9000]

(not a teacher)
Overall, I'd call it elision.
Where I'm from, "something" is pronounced "sum'thin".
Also, 3 could be considered a contraction.

 

[Tdol]

In BrE, summat is a common pronunciation of something.

 

[Raymott]

1. Would of > woulda

"Woulda" and "would've" are forms of "Would have". "Would of" is not English.

 

[Kate_i am]

I would say that it was a great assimilation in some cases. it'll I'm - contracted forms.
Would have- I think would've is possible to use as contracted form because it's too long in fluent speech.

 

[emsr2d2]

"Would of" is not English.

If only thousands (millions?) of Brits realised/believed/understood that. Bane of my life! ;-)