plural vs singular

• -is to


  -es
• -us to


  -i
• -ix , -ex to 


  -ices
• -um to


  -a
• -a to 


  -ae
• -oma to 


  -omata
• -on to 


  -a
• -nx to 


  -nges
• ax to


  -aces
• -en to


  -ina
• -itis to


  -itides