Authority can be used as another word for expert and starts with an "A".
Example: An authority on the subject of crime, notes that...
precise
BinomialBisectorBrackets One word can be "binomial". Another word can be" bracket[s]"
there is no filipino word that starts with letter x unless if you will ask about filipino slang words that starts with letter x.
width
testalation
professional
Another word for addition which starts with the letter N is New.
letter
Another word for water that starts with the letter 'O' is oxygen dihydrogen.
updated
Atop.
advertise
astamp
Astonishing.
Amazing
Orator is another word for speaker.
"Deceiver" is another word for liar that starts with the letter A.