Yes.
Boundary is stressed on the first syllable.
The stressed syllable is the the first syllable of the word. BOUN-da-ry
Yes, the second syllable in "boundary" is stressed. The stress falls on the "dar" syllable.
The first.
The stressed syllable in the word "boundary" is "bound."
Footprint is stressed on the first syllable.
Captive is stressed on the first syllable.
The first syllable is stressed.
Lightning is stressed on the first syllable.
In the word "lawyer," the first syllable "law" is stressed.
It is not entirely clear whether you are asking which syllable is stressed or what the first syllable is. The stressed syllable is the first syllable: sev.
Saunter is stressed on the first syllable.