The word 'shikaku' can have many meanings, all depending on the kanji used to write the word. Without seeing the Kanji, I cannot tell you for certain which context of 'shikaku' you're referring to. However, possibilities include: square, qualifications, blind spot, sense of sight, and assassin.
(屍鬼) lit. Corpse Demon
Death or (Dead) Wind
Strength
Strength.
This is not a Japanese word.
The most common word is "ryoku", but you can also use "riki" and "chikara". All three mean the same thing. You want to be careful though, because when you combine words in Japanese, they often change. For instance, if you want to say water power in Japanese, it becomes suiryoku even though the word for water is "mizu."
Abbi does not appear to be a Japanese word.
"Ecut" is not a Japanese word.
there is no word bhaga in japanese, baka is fool
"Charline" is not a Japanese word.
"Seriak" is not a Japanese word.
It isn't a word in Japanese.
Hyourin is not a Japanese word.
that's not a Japanese word
"Stampes" is not a Japanese word.