Whats difference between 'Dost' and 'Saathi'

Whats difference between 'Dost'  and 'Saathi'

1..Dost moseebat  mein kaam aata hai , 'Saathi' moseebat aaney hi nahi deta.

2..Date pr Dost saath ho aur 'Saathi' na ho to girlfriend naraz ho jaati hai.

3..Dost ka saath zindagi k liye lekin 'Saathi' ka saath kuch lamhe k liye hota hai..

4..Dost juda ho kr dhoka detey hein aur 'Saathi' phat kr..

5..Dost unmol hota hai, 'Saathi' 6 rupey k 4 miltey hein...