masculine nouns (sanskrit manual)

munih sage 
devah god
pashuh beast 

neuter
phalam fruit
vari water
madhu honey

feminine 
katha story 
nadi river
vadhuh wife

singular 
devah munih 
dual 
devau muni 
plural 
devaah munaya 

devah ends in ah all masculine ah nouns are declined like this
n devah
a devam 
i devena 
d devaaya 
a devat 
g devasya 
l deve 
v deva 

devau
devau 
devabhyam
devabhyam
devabhyam
devayoh
devayoh 
devau

devaah 
devaan
devaih 
devbhyah 
devbhyah 
devanaam 
devesu
devaah