What part of speech is and in ramesh suresh are good friends?

In the sentence "Ramesh Suresh are good friends", "and" is not present. Therefore, it's not possible to determine its part of speech.

However, if the sentence were "Ramesh and Suresh are good friends", then "and" would be a conjunction. It connects the two nouns "Ramesh" and "Suresh", making them a compound subject.