The letter W is between V and X.
W
The 7 letters on the lower row areZ X C V B N Mso answer is V letter
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ---V--X. That is, seven letter words with 4th letter V and 7th letter X. In alphabetical order, they are: gravlax
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern -V----X. That is, seven letter words with 2nd letter V and 7th letter X. In alphabetical order, they are: overlax overmix overtax
the letter A, the letter V, the letter X is the best example. If by perpendicular you mean 90º, the answer is E, F, I, L, and T. A, V and X are not perpendicular, they are acute angles.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern V-X--IS-. That is, eight letter words with 1st letter V and 3rd letter X and 6th letter I and 7th letter S. In alphabetical order, they are: vixenish
Q Quail V Vulture X X-Ray Tetra (fish)
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern V-X-D. That is, five letter words with 1st letter V and 3rd letter X and 5th letter D. In alphabetical order, they are: vexed
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern V-X-L. That is, five letter words with 1st letter V and 3rd letter X and 5th letter L. In alphabetical order, they are: vexil voxel
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern V-X-N. That is, five letter words with 1st letter V and 3rd letter X and 5th letter N. In alphabetical order, they are: vixen
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern V-X-S. That is, five letter words with 1st letter V and 3rd letter X and 5th letter S. In alphabetical order, they are: vexes
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern F-X---V-. That is, eight letter words with 1st letter F and 3rd letter X and 7th letter V. In alphabetical order, they are: fixative foxglove