ago
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.
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Atop.
Amazing
Astonishing.
advertise
astamp
Orator is another word for speaker.
Another word for delicious that starts with the letter 'A' could be appetizing. The definition of delicious is highly pleasing to the senses.
Authority can be used as another word for expert and starts with an "A". Example: An authority on the subject of crime, notes that...