slate
Please
I don't know whether they are letters that are lucky, but the letters S, N, L, R, & T are the most commonly used consonant letters in the English Language. I guess they could be lucky letters when playing Wheel of Fortune as they would likely be in the puzzle.
The letters can be used to spell farce plans. Each of the words use 5 of the 10 letters FSPECANLAR.
The answer is abaca.It's five letters, ending in A. Abaca is a banana tree native to the Philippines. The leafstalks are processed into Manila hemp, which is used to make rope and paper.
One word that fits this definition is ditch.
Those letters can be used to spell "direction".
tar
The Pilgrims used thatch roofs in the beginning. But because thatched roofs burned easily, they changed to plank roofs.
Flat roofs are used in low rainfall areas.
It is possibly the vowels: A I E O and U
Nylon
flour
It was used for roofs.
E, t, a, o, and i.
Sedum is used on roofs because it has shallow roots and is not very tall. Sedum can tolerate wind periods of no rain.
A stile.
I, O, W, X, and Y
The five letters that are always used as vowels are A, E, I, O, and U. These letters represent sounds that can be spoken without any restriction or closure of the mouth or throat.