Originally Posted by BrightSky9
Some differences would come from how often the plural and singular are used. "Man" as a male human is very common. "Mans" as in "he mans the boat" is much less common. Perhaps a group of "nixers" (like "naysayers") is more common than a single "nixer."
Both man and mans should be common 3 point words. It's a bug that sometimes man is worth six.
As to the deeper question of whether common suffixes should be worth the same (eg dog, dogs, dogged, dogger, doggers, dogging etc) i agree because we here all know to look for them. but that would be way too hard to reclassify them as this site jsearches see database to see how common the word is. So of it saw lots of dog but almost no doggers, then one is common and the other is ultra rare.