Is it deer resistant?

Yes

Bowwood is deer resistant.

Maclura pomifera

Deer: Rarely
Height: 70 ft (21.3 m)
Spread: 60 ft (18.3 m)
Zones: 4–10
Light: Full sun

Tree

Bowwood (Maclura pomifera)

Photo: Forest and Kim Starr · CC BY 3.0 us

Also called Hedge-Apple, Mapo, Osage-Orange

More details

Light: Full sun, Partial shade
Water: Low, Medium
Type: Tree
Maintenance: High, Low, Medium
Growth: Fast
Bloom: Spring, Summer
Foliage: Deciduous
Features: Drought tolerant, Flowering
Best uses: Hedge, Privacy, Shade tree