B.C.
The difference is the age of the chicken.
I'd buy chicks every now and then to replace the hens that were no longer laying. Hens will lay for several years, but will be incredibly tough near the end of their lives. Commerical egg operations will keep a laying hen for no longer than 3 years and usually no more than 2 years. I'd let my chickens roam around my farm and yard and you wouldn't believe the difference in eggs between my chickens and those in the average commercial operation.
A cornish game he is an 8-week old chicken. (Just like veal comes from a calf.)
A fryer is a 12 to 13 week old chicken.
A roasting/stewing chicken is 15 to 16 weeks old.
A laying hen is used to lay eggs for two to three years. Then it is processed into the chicken you find in chicken soup.
Dice the hen. Use it in recipes calling for diced chicken. When I have a recipe that calls for a stewing hen, I use an extra large fryer instead. Its the same meat, just more tender and usually cheaper. If you don't have a use for all of the diced hen, put the extra in snack baggies or sandwich baggies that have a good seal and freeze it for later. Take it out and use it one baggie at a time.
Good luck to you and yours