If you're an expert who gives advice or offers professional consultations, you can call yourself an adviser.
One who is turned against another or others with a design to oppose26 or resist them; a member of an opposing or hostile party; an opponent; an antagonist; an enemy; a foe.
Noun
an expert who gives advice; "an adviser helped students select their courses"; "the United States sent military advisors to Guatemala"
n.
One who advises.
Adviser
Ad`ver*sa*ry , n.;One who is turned against another or others with a design to oppose26 or resist them; a member of an opposing or hostile party; an opponent; an antagonist; an enemy; a foe.
Usage Examples
An empty stomach is not a good political adviser.
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Other Usage ExamplesI worked as a lawyer as a member of the teaching staff of a technical college and then I worked principally as legal adviser to Adolf Hitler and the National Socialist German Workers Party.