The Basque/Euskara word bederatzu
Word bederatzu
Meaning nine

Comments
Probably bimorphemic

Other words that might be of interest
guzti, ‘all’, guzi ‘all’, zortzi ‘eight’, le[h]en ‘first’, bortz ‘five’, laur ‘four’, bade ‘one’, zazpi ‘seven’, sei ‘six’, biga ‘two’