Some people still root for dictionaries and some people wanna see them gone in the age of cellphones and apps. I used to be one of the students who carry a dictionary everywhere and make a good use of it , Times has changed and I see some online tools and apps that are taking their places.
These are my top free online dictionaries
Nouns ending in -y
If the noun ends with a consonant plus -y, make the plural by changing -y to -ies:
Nouns ending in -f or -fe
With nouns that end in a consonant or a single vowel plus -f or -fe, change the -f or -fe to -ves:
If the noun ends with -ch, -s, -sh, -x, or -z, add -es to form the plural:
An honorable mention