Triumph(noun): 1. the act, fact, or condition of being victorious or triumphant; victory; conquest. 2. a significant success or noteworthy achievement; an instance or occasion of victory.

http://www.dictionary.com/browse/triumph

The Story of An Hour by Kate Chopin, “There was a feverish triumph in her eyes, and she carried herself unwittingly like a goddess of Victory.”  In this statement, Mrs. Mallard was happy that finally, something good will come to her yet she was not unaware of what would come next, she was unaware of that she was going to die.

Buoy: (noun):  float 2; especially, nautical: a floating object moored to the bottom to mark a channel or something (such as a shoal) lying under the water.

https://www.merriam-webster.com/dictionary/buoy

The word is from, Bio Lowe: I Always Write About My Mother When I Start To Write.

“I wanted to lay them, breathtaking, at her feet, and by doing to bind her heart to mine, ever after to be buoyed up like a raft on a calmed ocean.”

In this sentence the author is trying to expalin how he/she wanted to feel their mother close to her/his heart by thinking of the love towards the mother in the calm ocean.