Mucous is the adjectival form of the more familiar noun, mucus. In other words, mucous is actually the action or ability to make the yucky stuff we blow into tissue, which is mucus. There are mucous cells, mucous fluid, mucous membranes, and mucous glands. They are all different objects that can secrete mucus.
  Thus, if you have business income, you can contribute to your ROTH IRA if you are eligible and a SEP IRA. If your SEP IRA is likely to become substantial or you have funds in a 401(k) from a previous employer and you are an one person (or one person with a spouse) business, you should look into individual 401(k)s.
A SEP-IRA is a traditional IRA that holds contributions made by an employer under a SEP plan. You can both receive employer contributions to a SEP-IRA and make regular, annual contributions to a traditional or Roth IRA. Employer contributions made under a SEP plan do not affect the amount you can contribute to an IRA on your own behalf.