Two words
May be 2 words combined (bu+fetum) If not obvious, probably incorrect
b.u N 4 1 ABL S C
bus, bus N (4th) C [BAXDO] Early lesser
ox, bull; cow; cattle (pl.); (odd form mostly in Varro);
fet.um N 4 1 ACC S M
fetus, fetus N (4th) M [XXXAO]
offspring/young (animals); children (of a parent); brood/litter;
fetus/fetus, young while still in the womb; embryo (Cal);
birth/bringing forth young; laying (egg); bearing young, breeding; conception;
fruit of plant; produce/crop; offshoot/branch/sucker/sapling; bearing fruit;
fet.um ADJ 1 1 NOM S N POS
fet.um ADJ 1 1 VOC S N POS
fet.um ADJ 1 1 ACC S M POS
fet.um ADJ 1 1 ACC S N POS
fetus, feta, fetum ADJ [XXXBO]
pregnant/breeding (animal); fertile/fruitful; growing/teeming/abounding/full of
having newly brought forth/given birth/whelped/calved; bearing/reproducing;
*

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.