Hi Hoppity
Renfrewshire is a fairly large county with lots of small villages and parishes. You would need to be slightly more specific to help identify a possible burial ground.
Have you found them on the 1841 and 1851 census records ?
That would give you some idea of where to start looking.
Paisley is - and was, a reasonable sized town with several churches within the Burgh area itself so there are High, Middle and Low churches with a variety of other denominations also within the town.
Abbey was a broad descriptor for the wider Landward area around the town and took in villages like Neilston, Barrhead, Erskine, Elderslie and Johnstone. Additionally there are separate parishes like Lochwinnoch and Kilbarchan.
Without more detail it is needle in a haystack time.
Russell