Answer:
I would say mare and herba since it adds up to "sea" + "weed."
We all can assume seaweed as long and thin anyways, so sea + weed would add up I think.
Explanation:
edit: I meant grass not weed, but grass can be considered weed sometimes.
I don't understand how you are supposed to answer, but if you need two words per section in the sentences, I believe it would be something like
mare + aqua
herba + flos
ect.
