It has become popular to append the "-ome" suffix to various words to produce a new noun that indicates a set of things related to the word's prefix. So, for example, we have "transcriptome" indicating a set of gene transcripts, "metabolome" indicating a set of metabolites, and "exposome" indicating a set of things to which something is exposed.
Well known is "genome" - the set of all genes. The "proteome", the set of all protein, and the lipidome, the set of all lipids, are further ferquently seen siimilar words.
Words like "exoposome" are not unambigiuos: the Greek suffix "-some" for the Greek word soma indicates a "body", as used in exosome, poteasome, liposome, nucleosome etc.
The genetic information is stored in the DNA. It contains information about how to built other components of the cell. A "gene" is a part of the DNA containinf information for some particular component. This information is copied ("trans-scribed" -> transcripts) to smaller molecules (RNA) that are either already such components (regulatory RNAs, t-RNAs, r-RNAs) or which are blueprints to be transported to places in the cell where they are used to construct proteins (m-RNAs). So: gene-transcripts are RNA molecules that contain a copy of gene-sequences of the DNA.
See also: https://en.wikipedia.org/wiki/Gene_expression and links therein.
1. Also take a look at this list (List of omics topics in biolog. It includes about 40-plus 'Omes'. You can check out the list and find out which 'ome' contains a set of what. [ https://en.wikipedia.org/wiki/List_of_omics_topics_in_biology ]
2. Attached is a paper about 'Omic technology'. It might interest you.
I am very thank full to: Sir Rudi J Richardson, Jochen Wilhelm, and Yuan-Yeu Yau. In future, I will come up with technical question, Please spare a time for me, as I am new to molecular fields.