Oil • שֶׁמֶןShemen
First appears as a sacrificial libation by Jacob when he sets the stone on which he rested his head as a pillar. He anoints the pillar with oil. In Exodus, first identified as fuel.
Skin of a Dolphin or Badger • תַּחַשׁTachash
First appears as a name for Abraham's brother's concubine Reumah (follow that?) In Numbers 4, however goes on to refer animal skin and may have been a now extinct sheep.