I looked up Guava and see that it is tropical. I am in zone 8 in the southeast (I should have mentioned that). The fruit does resemble young Guava fruit.
There is a grove of these and they are intermingled with some Black Cherries, Wild Plums and Dog Roses.
Sorry there are not pears where I live. Looking at leaves in comparison they look more like pears.
...though...
"Another term for guavas is pera or variants thereof. It is common around the western Indian Ocean and probably derives from Spanish or Portuguese, which means "pear" " - wiki