Here is a list of nouns that start with TRA.

trace, trachea, tracing, track, tract

tractor, trade, trademark, trader, tradesmen

tradition, traditionalism, traditionalist, traffic, tragedy

trail, trailer, train, training, trainman

trait, traitor, trajectory, tramp, trampling

tramway, trance, tranquility, tranquilizer, tranquillity

transaction, transaminase, transcendence, transcript, transcription

transducer, transfer, transferee, transference, transferor

transferral, transformation, transformer, transgression, transience

transistor, transit, transition, translation, translator

translucence, translucency, transmission, transmitter, transmitting

transmutation, transom, transparency, transpiration, transport

transportation, transposition, transshipment, transvestitism, trap

trapdoor, trapezoid, trapper, trash, trauma

travel, traveler, traveller, travelogue, trawler

tray

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