Seam.
place something in an envelope together with a letter
Seam
Seem
seam
Seam.
The section of a garment or other product where two pieces of fabric have been sewn together is known as the 'seam'.
Seam (hope you thank me)
The pieces stuck together. This is because there will be more of a chain reaction, so there will be more neutrons available to leak in the first place.
place
Aviary.
Office.
Move or maybe jump?