- graphite, black lead, plumbago - used as a lubricant and as a moderator in nuclear reactors
--1 is a kind of carbon, C, atomic number 6
--1 has particulars: lead, pencil lead; pencil - plumbago - any plumbaginaceous plant of the genus Plumbago
--2 is a kind of herb, herbaceous plant
--2 is a member of genus Plumbago