does ((((milletvekili))))) have any thing attached to it
Millet + vekil + i
Can I translate milletvekili as deputy?
Yes, that seems like an acceptable translation.
'How many MPs are there in the parliament' was marked incorrect.
MP was accepted in a previous translation. This is what one would say in the UK.
Shouldn't "representatives" be accepted for "milletvekili"?
Report it please.
Parliamentarian ??? We can use this word!But it doesn't accept that.
Actually, you can't use that word here.
Parliamentarian is someone who supports the rule and dominance of the parliament.
How many congressmen are in the chamber?
How many congressmen are in the parliament?
IMHO these two alternatives are better constructs than using two times "parliament" as in the proposed answer - and should at least be accepted as correct also.
In UK congressmen is never used to do with parliament. They are usually called MP's as an alternative. Chamber is used with regard to lawyers in UK but America uses different words. The original answer sounds fine to me too as a UK born person.