Yes, "over the rainbow" is a prepositional phrase.
Yes, "over the rainbow" is a prepositional phrase.
Yes, "rainbow" is a noun phrase. It consists of the noun "rainbow" along with any associated adjectives (e.g., "beautiful rainbow") or determiners (e.g., "the rainbow").
An idiom is a phrase that makes no sense unless you know the definition. Could there be "somewhere over the rainbow?" Yes, you could have a place that was beyond or over a rainbow, so this is not an idiom. The song is talking about a place that Dorothy thinks is better than where she is now, that she thinks might be beyond the rainbow she sees.
Over the Rainbow was created in 1992.
row g bib row
no
be mine or be in me
A pot of gold is ushualy over the rainbow (lol)
Rainbow Over Texas was created in 1946.
Somewhere over the rainbow :d
The duration of Over the Rainbow - film - is 1.82 hours.
Rainbow Batter, rainbow frosting and rainbow sprinkles in a rainbow cupcake liner