The first step of parsing is to work out from which verb the word comes. For sonant, this is sono, sonare, sonui, sonitum, a first conjugation verb meaning I make a noise/sound.The -nt ending indicates that this verb is 3rd person pl (they).The ending is an active ending, and therefore the voice is active.The mood of the verb is indicative.The present, active, indicative endings go -o, -as, -at, -amus, -atis, -ant.Therefore, sonant is the 3rd person plural present active indicative of sono, sonare, sonui, sonitum.