ONE - "Dragonfly brooch" potentially brings in 70% more traffic than "dragonfly pin."
TWO - Although there are more than 3 times as many searches online for "flower earrings" than for "floral earrings", there are almost 7 times as many "flower earrings" to be found online. "Floral earrings" would likely bring in TWICE as much traffic than "flower earrings."
THREE - If you are selling a rose ring you can potentially get more traffic using "rose ring" than you would if you use the keyword "flower ring." Although there are almost 60% more searches for "flower ring" there are almost 4 times as many "flower ring" results online than there are for the keyword "rose ring." Therefor "rose ring" could potentially return 2.5 times more traffic.
FOUR - There are 45 times as many people searching for "rabbit necklace" than there are people searching for "rabbit pendant." You could potentially have 4700% more traffic with the use of "rabbit necklace" as your keyword. By the same token "rabbit necklace" is a much more highly searched keyword than "bunny necklace" by as much as 47 times the searches.
FIVE - Do plurals make a difference? Yes. There are 6 times as many people searching for "costume jewelry brooches" than there are searching "costume jewelry brooch." There are roughly the same number of costume jewelry brooches in the results online as there are costume jewelry brooch, however the plural will attract more than 6 times the traffic.
SIX - In the case of "dragonfly necklaces" verses "dragonfly necklace", although the plural has one tenth in terms of searches it has the potential of attracting 3 times the traffic. While you will likely title your product and your product description with the singular version, you could certainly label your photo with the plural.
SEVEN - There are 9 times as many people searching for a "crystal necklace" as there are searching for a "Swarovski necklace." Even if your necklace is made with Swarovski crystal you may get almost 80% more traffic by labelling your image with the keyword "crystal necklace."
EIGHT - "Butterfly Necklace" can potentially bring in twice as much traffic than "butterfly pendant."
NINE - Although "seahorse necklace" can bring in good traffic, seahorse earrings will potentially bring in 3.5 times more traffic.
TEN - "Dolphin ring" brings in more traffic than "dolphin earrings", even though there are more searches for "dolphin earrings" than there are for a "dolphin ring." This is because there is much less supply than demand for dolphin rings.