Hello!
There are a few points/questions about the classification:

1. If they're suburbs then of which town/city?

2. E.g. https://en.wikipedia.org/wiki/Candolim says its a "census town" which in Indian terms means a well-developed village with a population > 5000. It doesn't say Candolim is a suburb of a bigger urban entity.

3. So they should be either towns or villages?

4. There seems to be no hard min of population for a town i OSM. https://wiki.openstreetmap.org/wiki/Tag%3Aplace%3Dtown says its varies between the countries and As of mid-2019, 34% of place=town have a population=* tag, and 
"the median (average) value in the database varies by country, from as low as 3000 to as high as 35,000. But 95% of place=town have a population=* value between 1000 and 70,000. "

So seems like place=town is fitting, no?

Please clarify! Thanks!