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.
Strength.
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."
This is not a Japanese word.
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
that's not a Japanese word
"Charline" is not a Japanese word.
It isn't a word in Japanese.
"Stampes" is not a Japanese word.
"Seriak" is not a Japanese word.
Miguel is not a Japanese word so it has no meaning.