kangaroo, kilo,
kimono
The Maori word for talk starting with a "k" and ending with an "o" is "kōrero."
outbreak
AlamoAmigoAminoAudio
overyou
outlook, oarlock
Cameo
orange
oceanographer
oaf
ZAMPO, zippo
aerobicacerbicarchaicasceticelasticidioticidyllicorganic
grep '\<h.*o\>'