Final answer:
The words in the poem 'Oh Captain! My Captain' that relate to the sea and sailing are ship, sail, and ocean.
Step-by-step explanation:
The words in the poem 'Oh Captain! My Captain' that relate to the sea and sailing are:
1) Ship: The ship is referenced several times throughout the poem, representing the journey taken.
2) Sail: The word 'sail' is not explicitly mentioned in the poem, but the mention of 'sailing' implies the use of sails for propulsion.
3) Ocean: While the word 'ocean' is not used, the phrase 'the ship has weather'd every rack' suggests conquering tumultuous waters.