Yes but when you scroll down on a word that you can add "s" to or use it in a different form it says so

ex: http://dictionary.reference.com/search?q=cat
cat Audio pronunciation of "cat" ( P ) Pronunciation Key (kt)
n.
v. cat·ted, cat·ting, cats
BabyFacedAbortion Reviewed by BabyFacedAbortion on . Calling all stoners! I have a challenge for you. What is the plural form of the word "lettuce". I will not paypal a dollar to the first person who finds it. GO! :dance: Rating: 5