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Since (adverb)
From a specified time in the past.
“I met him last year, but haven’t seen him since.”
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Since (preposition)
From: referring to a period of time ending in the present and defining it by the point in time at which it started, or the period in which its starting point occurred.
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Since (preposition)
Continuously during that period of time.
“I have known her since last year.”
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Because (adverb)
For the reason that.
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Because (adverb)
On account of, for sake of.
“My life is ruined because of you!”
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Because (adverb)
Used alone to refuse to provide a full answer a question begun with “why”, usually taken as an anapodoton of the elided full phrase “Because I said so”.
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Because (conjunction)
By or for the cause that; on this account that; for the reason that.
“I hid myself because I was afraid.”
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Because (conjunction)
As is known, inferred, or determined from the fact that.
“It must be broken, because I pressed the button and nothing happened.”
“He’s not a nice guy, because he yells at people for no reason.”
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Because (conjunction)
So that, in order that. 15th-17th c.
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Because (preposition)
On account of, because of. since at least the 20th century
“I went to the store because hungry.”