things is narrow if the two things are quite close together and there is not a lot of room between them. the street in the picture is very narrow. the opposite of narrow is wide.
narwhals are a kind of medium sized whale that has a long tusk growing from the middle of their head, like a unicorn's horn. they live in the northern part of the world, in the arctic waters.
nasturtiums are a common plant grown for their pretty flowers. nasturtium's leaves and flowers are edible and can be used in salads. nasturtiums attract good insects to the garden and repel bad ones like some caterpillars and are often grown 