You can defferitiate between both of what you have asked by syllables
Syllables may be weak
In word-final position spelt with final y or ey after one or more consonant letters, e.g. happy
In words ending with suffixes beginning with vowels, e.g.  happier.
Note: strong syllables may have any vowel except for [ ə, i, u ].

 
Safwat,  
I am extremely grateful for your help
May I ALLAh fulfil your hopes and wishes.
Thank you again.