A round trip refers to a journey from one place to another and then back to the starting point. It involves traveling to a destination and then returning to the original location, completing a full circle.
"Out and back" in the context of a round trip journey means traveling to a destination and then returning along the same route. It refers to a journey where the same path is taken both to and from the destination.
they both relate to distance.
they both can spin round and round
They both have glass and they both magnify.
They relate because there ar both gasses
it is a noun
Both depending on what your entire sentence is. Try writing the sentence with both and reading it aloud. Whichever one sounds better go with.
relate. Ex: i relate to your personality because we both like Manga.
Both relate to a region that is disputed between countries.
They are both tiny
they are both acidic
They are both names.