According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern C-VE---D. That is, eight letter words with 1st letter C and 3rd letter V and 4th letter E and 8th letter D. In alphabetical order, they are:

caveated

caverned

coverlid

coversed

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern C---RSED. That is, eight letter words with 1st letter C and 5th letter R and 6th letter S and 7th letter E and 8th letter D. In alphabetical order, they are:

coversed

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern C--ERSE-. That is, eight letter words with 1st letter C and 4th letter E and 5th letter R and 6th letter S and 7th letter E. In alphabetical order, they are:

coversed

cybersex

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern CO-E-S-D. That is, eight letter words with 1st letter C and 2nd letter O and 4th letter E and 6th letter S and 8th letter D. In alphabetical order, they are:

coversed

There can be no equivalence.

A milligram is a measure of mass. A millilitre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.

If you are not convinced, consider a millilitre of air. How many milligrams? Next consider a millilitre of lead. How many milligrams? The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.