It looks like you're interested in identifying the primary stress of various words. Here’s a breakdown based on standard English pronunciation:

1. **ancestor**: 1st syllable (AN-cestor)
2. **basic**: 1st syllable (BA-sic)
3. **ethnic**: 1st syllable (ETH-nic)
4. **complicated**: 1st syllable (COM-pli-cated)
5. **recognize**: 1st syllable (REC-ognize)
6. **vocabulary**: 2nd syllable (vo-CAB-u-lary)
7. **archway**: 1st syllable (ARCH-way)
8. **diversity**: 2nd syllable (di-VER-sity)

And for the words in the right column:

A. **curious**: 1st syllable (CUR-i-ous)
B. **diverse**: 2nd syllable (di-VERSE)
C. **heritage**: 1st syllable (HER-it-age)
D. **custom**: 1st syllable (CUS-tom)
E. **visit**: 1st syllable (VIS-it)
F. **significant**: 2nd syllable (sig-NIF-i-cant)
G. **waterwheel**: 1st syllable (WATER-wheel)
H. **photographic**: 3rd syllable (pho-to-GRAPH-ic)
I. **unique**: 2nd syllable (u-NIQUE)
J. **entertainment**: 3rd syllable (en-ter-TAIN-ment)
K. **pollutant**: 2nd syllable (pol-LU-tant)
L. **worship**: 1st syllable (WOR-ship)
M. **accept**: 2nd syllable (ac-CEPT)
N. **alternative**: 2nd syllable (al-TERN-a-tive)
O. **compliment**: 1st syllable (COM-pli-ment)
P. **anniversary**: 4th syllable (an-ni-VER-sa-ry)
Q. **blossom**: 1st syllable (BLOSS-om)
R. **activity**: 2nd syllable (ac-TIV-i-ty)

Let me know if you need further assistance!