The phrase two-way can be interchanged with the words bidirectional, dual-carriageway, duplex, or round-trip. Bidirectional means going in two directions, while dual-carriageway refers to a road with two lanes in each direction. Duplex means having two parts, and round-trip refers to a journey that goes in two directions, such as a flight. These words can be used in different contexts, such as communication systems or transportation. It is important to know synonyms for words to enhance one's vocabulary and improve both written and verbal communication skills.